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Phono Solar Brand review

NS-620MH-120

620 Wp N-type
ComparePV verdict

Middle of its segment, modest efficiency

Rank 4,152 of 14,005
Compare panels Datasheet PDF
Power (Wp)
620
Typical for its class
Efficiency (%)
21.90
Weak · bottom 4%
Density (Wp/m²)
219.1
Weak · bottom 4%
Temp (%/°C)
-0.290
Typical · median -0.290
Weight (kg)
31.0
Typical · median 32.5 kg
Warranty (yrs)
25
Weak · bottom 4%

The Phono Solar Monocrystalline 120 series consists of modules based on 120 half-cut cells, designed to operate reliably even when part of the cell is intermittently shaded (e.g., by a chimney, skylight, or tree). The use of mono PERC technology improves light absorption and supports energy generation in weaker lighting conditions, which, in the Polish climate, translates into more predictable energy production in spring, autumn, and on cloudy days. The half-cut design reduces resistance losses and reduces the risk of localized overheating, allowing the module to maintain its parameters for longer.

This is a good choice for residential and small commercial installations, where the trade-off between the power of a single panel and ease of installation is important. A key advantage over many competitors is the refined resistance to micro-cracks and the watertight junction box with a high level of protection, which makes it easier to operate on roofs exposed to moisture and large temperature variations.

Ranking

359 panels in the segment N-type 600-650 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.90% 22.77% Weak · bottom 4% 6,783
Power density 219.1 227.7 Weak · bottom 4% 6,743
Temperature coefficient -0.290 -0.290 Typical 2,165
Weight per kWp 50.0 52.7 Typical 3,317
Performance warranty 25 yrs 30 yrs Weak · bottom 4% 9,798
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

5 positive · 7 caution
Best for

Commercial, utility-scale and shaded-installations.

Not ideal for

Tight roof space, roofs where every square metre has to count and owners who want a long output guarantee.

Watch-outs
21.90% module efficiency

Bottom 4% of the N-type 600-650 W segment, against a median of 22.77%. Ranked 6,783rd in the whole database.

219.1 watts per square metre

Bottom 4% of the N-type 600-650 W segment, against a median of 227.7. Ranked 6,743rd in the whole database.

25 year performance warranty

Bottom 4% of the N-type 600-650 W segment, against a median of 30 yrs. Ranked 9,798th in the whole database.

What owners get
N-type cells with half-cut design

120 half-cut N-type cells reduce resistive losses and LID/LeTID degradation compared to older P-type technology, and splitting each cell in half limits the impact of partial shading on overall module output.

Long-established Tier-1 manufacturer

Phono Solar has operated since 2004 and has repeatedly been confirmed on BloombergNEF's Tier 1 'bankability' list, which eases project financing through banks and lending institutions.

Power output up to 660 Wp matches segment leaders

The 660 Wp upper power limit matches flagship series from competitors like Longi Hi-MO 9 and Canadian Solar TOPBiHiKu6, despite the Monocrystalline120 series dating back to 2018 and not using the latest cell generations.

Enhanced mechanical durability and sealing

The manufacturer highlights refined micro-crack resistance and a sealed, high-IP-rated junction box, relevant for roof installations exposed to moisture and wide temperature swings typical of the Polish climate.

Documented field track record

The series was produced from 2018 to 2023, providing several years of real-world field performance data - unlike newly launched series that lack a long-term operational history.

Trade-offs
Production discontinued in 2023

The Monocrystalline120 series has been phased out (end_year: 2023), meaning limited availability of spare parts and more difficult warranty servicing for individual module failures over the long term.

Efficiency lags behind leading N-type peers

Maximum efficiency of 23.32% is roughly 1.08 pp lower than Longi Hi-MO 9 (24.4%) or Canadian Solar TOPBiHiKu6 (24.4%), translating to a somewhat lower energy yield for the same roof area.

No bifacial variant available

Unlike some comparable series from competitors (e.g., Canadian Solar TOPBiHiKu6), Monocrystalline120 does not offer bifacial modules, ruling out an additional 5-15% albedo-driven yield gain on ground-mount or high-reflectivity roof installations.

25-year power warranty below the current standard

The linear power warranty is capped at 25 years, shorter than the 30-year warranties Phono Solar already offers on newer series (e.g., PS590M8GF-24 guaranteeing 87.4% power at year 30), making this series less competitive against current N-type market offerings.

Notes from the database
  • At 21.9% efficiency, this panel is 0.9pp below the N-type 600-650W median of 22.8%
  • 219.1 W/m² power density is 8.6 W/m² below N-type 600-650W median (227.7 W/m²) - requires larger installation area
  • Temperature coefficient of -0.29%/°C matches the N-type 600-650W median
  • 31.0 kg weight - 1.5 kg lighter than N-type 600-650W median (32.5 kg), reducing installation effort
  • In the top 48% for efficiency among all N-type panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 620 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.90 % Weak Segment median 22.77%
Vmpp · Impp 37.06 V · 16.73 A Operating point at max power
Voc · Isc 44.87 V · 17.27 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2172×1303×30 mm · 2.83 m² of roof
Weight 31.0 kg Typical Typical · median 32.5 kg
Cells 120 · N-type Monocrystalline
Coefficient Pmax -0.290 %/°C Typical median -0.290 of its segment
Coefficient Voc · Isc -0.250 · 0.045 %/°C
NOCT 45 °C At 800 W/m², 20 °C ambient
Product warranty 15 years Hardware defects only
Performance warranty 25 years Weak bottom 4% · median 30 yrs

Datasheet charts

Open datasheet PDF

Measured curves published by Phono Solar in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 620 Wp appear here. The rest cover the whole series.

Current-Voltage Curve Current-Voltage Curve Whole series Power-Voltage Curve Power-Voltage Curve Whole series Voltage-Current Curve at Different Temperatures Voltage-Current Curve at Different Temperatures Whole series

Simulations

Live - change any input
Lifetime output & value
30 years at 1200 kWh/kWp/year and €0.50 per kWh
Power in year 30
-
Lifetime energy
-
Energy value
-

Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.

Heat losses
-0.290 %/°C against a segment median of -0.290
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Phono Solar NS-620MH-120 620 W 21.90% -0.290 31.0 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg Lighter, +3.3 pp, +5 yr warranty
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg Lighter, +3.1 pp, +5 yr warranty
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg +50 W, +2.9 pp, +5 yr warranty
LR7-72HVHF-670M 670 W 24.80% -0.260 28.5 kg +50 W, +2.9 pp, +5 yr warranty
AIKO-A640-MAE72Mw 640 W 24.80% -0.260 27.0 kg Lighter, +2.9 pp, +5 yr warranty
JKM650-670N-66QL6-BDV (670W class) 670 W 24.80% -0.260 32.5 kg +50 W, +2.9 pp, +5 yr warranty
NS-630MH-120 630 W 22.26% -0.290 31.0 kg +10 W, +0.4 pp
NS-640MH-120 640 W 22.61% -0.290 31.0 kg +20 W, +0.7 pp
NS-650MH-120 650 W 22.96% -0.290 31.0 kg +30 W, +1.1 pp
NS-660MH-120 660 W 23.32% -0.290 31.0 kg +40 W, +1.4 pp
GKA210N120 680 W 24.03% -0.340 28.0 kg +60 W, hotter, +2.1 pp
GKA210N120-675 675 W 23.85% -0.340 28.0 kg +55 W, hotter, +2.0 pp
QN-670HJT-01 670 W 23.70% -0.240 35.5 kg +50 W, +1.8 pp, +5 yr warranty
GKA210N120-670 670 W 23.67% -0.340 28.0 kg +50 W, hotter, +1.8 pp
QN-665HJT-01 665 W 23.50% -0.240 35.5 kg Cooler, +1.6 pp, +5 yr warranty
GKA210N120-665 665 W 23.50% -0.340 28.0 kg Hotter, +1.6 pp, +5 yr warranty

Found 497 panels of the same or similar size to this one, within ±10 mm. See them here Found 502 panels of the same or similar size to this one, within ±25 mm. See them here Found 502 panels of the same or similar size to this one, within ±50 mm. See them here Found 506 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
Is the Phono Solar Monocrystalline120 series still available for purchase?
The Phono Solar Monocrystalline120 series has been discontinued and is no longer actively offered by the manufacturer. Individual units may still be found at distributors clearing old stock, but purchasing carries a risk of limited availability for replacement panels in case of future failures. Buyers should consider a current Phono Solar series with active support and full component availability.
What warranty does Phono Solar offer on the Monocrystalline120 series?
The Monocrystalline120 series came with a 15-year product warranty covering material and manufacturing defects, and a 25-year linear power output warranty. This means the panel is guaranteed to retain at least the specified minimum efficiency over a quarter-century. Keep in mind that since the series is discontinued, enforcing warranty claims over the long term may be more difficult than with actively produced models.
What advantage does N-type cell technology in the Phono Solar Monocrystalline120 offer over standard PERC?
N-type cells exhibit lower light-induced degradation (LID) and higher efficiency under low-irradiance conditions compared to conventional p-type PERC. In practice this means better energy yield during spring, autumn, and overcast days common in Central European climates. N-type modules also degrade more slowly over time, resulting in a shallower power loss curve across the panel's operational lifetime.
How do the 120 half-cut cells affect system performance under partial shading?
The 120-cell half-cut layout splits the module into two independent electrical halves. When one section is shaded by a chimney or dormer window, the other half continues operating at full capacity, minimizing overall yield loss. Half-cut cells also reduce resistive losses due to lower in-cell current and decrease the risk of hot-spot formation, extending the long-term reliability of the module.
What is the peak power output of the Phono Solar Monocrystalline120 and what installations is it suited for?
The top variant of the series reaches 660 Wp, placing it in the high power-density segment. The series was designed for residential rooftops and small commercial installations where maximizing yield from a limited roof area is the priority. Its high unit output allows building the required system capacity with fewer panels, simplifying the racking structure and reducing installation labor.
How well does the Phono Solar Monocrystalline120 handle the Polish climate and large temperature swings?
The series was built for demanding weather conditions. The high-IP-rated junction box protects against moisture and heavy rainfall. Enhanced resistance to microcracks limits damage from thermal expansion and contraction caused by large daily temperature swings common in Poland. N-type cell technology also mitigates the power temperature coefficient effect, reducing output losses during hot summer days.
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